ungetwc(3)

Synopsis

Description

The
ungetwc()
function is the wide-character equivalent of the
ungetc(3)
function.
It pushes back a wide character onto
stream
and returns it.

If
wc
is
WEOF,
it returns
WEOF.
If
wc
is an invalid wide character,
it sets
errno
to
EILSEQ
and returns
WEOF.

If
wc
is a valid wide character, it is pushed back onto the stream
and thus becomes available for future wide-character read operations.
The file-position indicator is decremented by one or more.
The end-of-file
indicator is cleared.
The backing storage of the file is not affected.

Note:
wc
need not be the last wide-character read from the stream;
it can be any other valid wide character.

If the implementation supports multiple push-back operations in a row, the
pushed-back wide characters will be read in reverse order; however, only one
level of push-back is guaranteed.

Return Value

The
ungetwc()
function returns
wc
when successful, or
WEOF
upon
failure.

Attributes

Conforming To

Notes

See Also

Colophon

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man-pages
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and the latest version of this page,
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License & Copyright

Copyright (c) Bruno Haible
%%%LICENSE_START(GPLv2+_DOC_ONEPARA)
This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
%%%LICENSE_END
References consulted:
GNU glibc-2 source code and manual
Dinkumware C library reference http://www.dinkumware.com/
OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
ISO/IEC 9899:1999